Tata Power Interview Questions, Process, and Tips

The contact resistance of VCB is typically very low.

• VCB stands for Vacuum Circuit Breaker.

• The contact resistance is the resistance between the contacts of the breaker when it is closed.

• The contact resistance of VCB is typically in the range of micro-ohms.

• Low contact resistance is important for efficient operation of the breaker.

• High contact resistance can cause overheating and damage to the breaker.

• The contact resistan...read more

The resistance value of tripping & closing coil of VCB varies depending on the manufacturer and model.

• The resistance value can be found in the manufacturer's manual or datasheet.

• It is important to use the correct resistance value to ensure proper functioning of the VCB.

• The resistance value may also vary depending on the voltage rating of the VCB.

• For example, the ABB VD4 VCB has a tripping coil resistance of 50-60 ohms

The minimum height at which the safety belt should be used is determined by the height of the individual and the specific safety regulations in place.

• The minimum height requirement for safety belt usage varies depending on the country and jurisdiction.

• In the United States, for example, the minimum height for safety belt usage is typically around 4 feet 9 inches (145 cm).

• Other factors such as age, weight, and type of ve...read more

Magnetic core balance test is done to measure the balance of magnetic cores in a transformer.

• The test is performed by injecting a current into one winding of the transformer and measuring the voltage induced in the other winding.

• The test is repeated for each winding of the transformer.

• The results are compared to determine if the magnetic cores are balanced.

• If the magnetic cores are not balanced, it can lead to increase...read more

Power factor is a measure of how effectively electrical power is being used and it affects the efficiency of electrical systems.

• Power factor is the ratio of real power (kW) to apparent power (kVA) in an electrical system.

• It indicates how much of the total power is being used for useful work.

• A power factor of 1 means all the power is being used effectively, while a power factor less than 1 indicates inefficiency.

• Low pow...read more

Active power is the actual power consumed by a device or system.

• Active power is measured in watts (W).

• It is the power that is actually doing the work.

• It is the product of voltage and current in an AC circuit.

• It is also known as real power.

• For example, a 100W light bulb consumes 100W of active power.